1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
|
/*-
* Copyright (c) 2011 Google, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* Userboot disk image handling.
*/
#include <stand.h>
#include <stdarg.h>
#include <uuid.h>
#include <bootstrap.h>
#include "disk.h"
#include "libuserboot.h"
int userboot_disk_maxunit = 0;
static int userdisk_init(void);
static int userdisk_strategy(void *devdata, int flag, daddr_t dblk,
size_t size, char *buf, size_t *rsize);
static int userdisk_open(struct open_file *f, ...);
static int userdisk_close(struct open_file *f);
static void userdisk_print(int verbose);
struct devsw userboot_disk = {
"disk",
DEVT_DISK,
userdisk_init,
userdisk_strategy,
userdisk_open,
userdisk_close,
noioctl,
userdisk_print,
NULL
};
/*
* Nothing to do here.
*/
static int
userdisk_init(void)
{
return(0);
}
/*
* Print information about disks
*/
static void
userdisk_print(int verbose)
{
int i;
char line[80];
struct disk_devdesc dev;
for (i = 0; i < userboot_disk_maxunit; i++) {
sprintf(line, " disk%d: Guest drive image\n", i);
pager_output(line);
dev.d_dev = &userboot_disk;
dev.d_unit = i;
dev.d_slice = -1;
dev.d_partition = -1;
dev.d_offset = 0;
sprintf(line, " disk%d", i);
disk_print(&dev, line, verbose);
}
}
/*
* Attempt to open the disk described by (dev) for use by (f).
*/
static int
userdisk_open(struct open_file *f, ...)
{
va_list ap;
struct disk_devdesc *dev;
va_start(ap, f);
dev = va_arg(ap, struct disk_devdesc *);
va_end(ap);
if (dev->d_unit < 0 || dev->d_unit >= userboot_disk_maxunit)
return (EIO);
return (disk_open(dev));
}
static int
userdisk_close(struct open_file *f)
{
return(0);
}
static int
userdisk_strategy(void *devdata, int rw, daddr_t dblk, size_t size,
char *buf, size_t *rsize)
{
struct disk_devdesc *dev = devdata;
uint64_t off;
size_t resid;
int rc;
if (rw == F_WRITE)
return (EROFS);
if (rw != F_READ)
return (EINVAL);
if (rsize)
*rsize = 0;
off = (dblk + dev->d_offset) * DISK_SECSIZE;
rc = CALLBACK(diskread, dev->d_unit, off, buf, size, &resid);
if (rc)
return (rc);
if (rsize)
*rsize = size - resid;
return (0);
}
|
